Rational. There are 3 types of decimal
1) Terminating (stop after a certain number of places - no matter how many)
2) Recurring (repeat a digit of some digts e.g. 0.547547547547547......)
3) Infinite decimals which do not have a recurring patter.
1) and 2) are rational. Only 3) is irrational, number like Pi and root 2.
Your number is type 1) and can be written as 76215/100000 = 15243/20000
which is a rational number (fraction).
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Irrational.
The product of a rational and irrational number can be rational if the rational is 0. Otherwise it is always irrational.
It will be irrational.
No.A rational times an irrational is never rational. It is always irrational.
Next to any rational number is an irrational number, but next to an irrational number can be either a rational number or an irrational number, but it is infinitely more likely to be an irrational number (as between any two rational numbers are an infinity of irrational numbers).